Sephira Crystals

Sephira Crystals (霊結晶セフイラ,SefiraRei Kesshō?) are mysterious, round, orb-like gems that contain Angels, can turn humans into Spirits and serve as the power source of their Spirit Form. They also have alternate forms called Qlipha Crystals that contain Demon Kings and serve as the power source of the Spirits' Inverse Forms.

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In order for a Sephira Crystal to turn a human into a Spirit, they simply need to touch it. The gem is then absorbed into the one who touched it and will turn that person into a Spirit. When Origami was being turned into a Spirit, she described the feeling as "as if a second heart was being created inside her".

Human beings have varying levels of compatibility for becoming a host for the Sephira Crystals, with Phantom stating that Origami was an exceptional user due to wielding her angel so skillfully.

As seen from Kotori's example, Sephira Crystals can be toxic to the host's body, and can even induce madness. As a result, Mio stated that they need to be further refined by killing the initial host and then transplanting the gem into another host. Doing so, would ensure that the Sephira Crystals will come closer to completion and resolve the negative drawbacks.

So far, there have shown to be three ways for a Sephira Crystal can be removed from a Spirits' body. The first method is to kill the Spirit. Second, seal all the Spirits' mana in Shido's body and then use a Realizer to remove it from his body in the form of a new Sephira Crystal. Finally, Artemisia has also shown the ability to remove a Qlipha Crystal through unknown means by using her territory. Ellen also says that she possesses a similar ability.

According to Inverse Tohka, the Sephira Crystals first emerged as Qlipha Crystals when the First Spirit decided to divided her power. The Inverse Spirit later speculates that she reversed their properties into Sephira Crystals in order to make them more compatible for human hosts.

<Phantom> has had at least four Sephira Crystals in her possession, which she gave Kotori Itsuka, Miku Izayoi, Origami Tobiichi, and Mukuro Hoshimiya, turning all four of them into Spirits. Meanwhile, Kurumi Tokisaki was given her crystal by Mio Takamiya, the First Spirit. It's currently unknown how the other Spirits acquired their Sephira Crystals.